将标签文本设置为不透明

Question

我有一个带标签的网格，每个“Tile”都有透明的背景颜色，但文字也显示为透明。有没有办法从标签文本中删除透明度？

我的代码：

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="LoyaltyWorx.GridMenu"
             BackgroundImage="grid.jpg"
             Title="Main Menu"
             >
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="2*" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="1*" />
            <ColumnDefinition Width="2*" />
        </Grid.ColumnDefinitions>
        <Label Text="Cards" TextColor="White" FontAttributes="Bold" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" Grid.Row="0" Grid.Column="0" BackgroundColor="#1481BA"  Opacity="0.5" x:Name="CardTile"/>
        <Label Text="Transactions" TextColor="Black" FontAttributes="Bold" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" Grid.Row="0" Grid.Column="1" BackgroundColor="#ede890" Opacity="0.5" x:Name="TransactionTile"/>
        <Label Text="Promotions" TextColor="White" FontSize="30" FontAttributes="Bold" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" Grid.Row="1" Grid.Column="0" BackgroundColor="#1481BA"  Grid.ColumnSpan="2" Opacity="0.7" x:Name="PromoTile"/>
        <Label Text="Settings" TextColor="Black" FontAttributes="Bold" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" Grid.Row="2" Grid.Column="0" BackgroundColor="#ede890" Opacity="0.5" x:Name="SettingsTile" />
        <Label Text="My Profile" TextColor="White" FontAttributes="Bold" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" Grid.Row="2" Grid.Column="1" BackgroundColor="#1481BA" Opacity="0.5" x:Name="ProfileTile"/>
    </Grid>
</ContentPage>

截图：

Answer 1

您需要在StackLayout中添加标签，如下所示：

<StackLayout Grid.Row="0" Grid.Column="0" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand" BackgroundColor="#1481BA" Opacity="0.5" >
    <Label Text="Cards" TextColor="White" FontAttributes="Bold" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" BackgroundColor="Transparent" x:Name="CardTile"/>
</StackLayout>

您也可以使用Frame代替StackLayout

Answer 2

在标签上，将BackgroundColor属性设置为0.5 alpha（128 = 0x80），并将不透明度保持为1.0。

  <Label ... BackgroundColor="#801481BA"  Opacity="1.0" />